Fixed: Jackett indexer search performance

(cherry picked from commit 29bc660cfbd8fae808b45ddd55c63c7fdd8a2f75)

src/NzbDrone.Common.Test/Http/HttpRateLimitKeyFactoryFixture.cs

@@ -0,0 +1,30 @@
+using FluentAssertions;
+using NUnit.Framework;
+using NzbDrone.Common.Http;
+
+namespace NzbDrone.Common.Test.Http
+{
+    [TestFixture]
+    public class HttpRateLimitKeyFactoryFixture
+    {
+        [TestCase("http://127.0.0.2:9117/jackett/api/v2.0/indexers/viva/results/torznab/api?t=search&cat=5000,5070,100030,100041", "127.0.0.2:9117/jackett/api/v2.0/indexers/viva")]
+        public void should_detect_jackett(string url, string expectedKey)
+        {
+            var request = new HttpRequest(url);
+
+            var key = HttpRateLimitKeyFactory.GetRateLimitKey(request);
+
+            key.Should().Be(expectedKey);
+        }
+
+        [TestCase("http://127.0.0.2:9117/jackett", "127.0.0.2")]
+        public void should_default_to_host(string url, string expectedKey)
+        {
+            var request = new HttpRequest(url);
+
+            var key = HttpRateLimitKeyFactory.GetRateLimitKey(request);
+
+            key.Should().Be(expectedKey);
+        }
+    }
+}

src/NzbDrone.Common/Http/HttpClient.cs

@@ -109,7 +109,7 @@ namespace NzbDrone.Common.Http
 
             if (request.RateLimit != TimeSpan.Zero)
             {
-                _rateLimitService.WaitAndPulse(request.Url.Host, request.RateLimit);
+                _rateLimitService.WaitAndPulse(HttpRateLimitKeyFactory.GetRateLimitKey(request), request.RateLimit);
             }
 
             _logger.Trace(request);

src/NzbDrone.Common/Http/HttpRateLimitKeyFactory.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+namespace NzbDrone.Common.Http
+{
+    public static class HttpRateLimitKeyFactory
+    {
+        // Use a different key for jackett instances to prevent hitting the ratelimit for multiple separate indexers.
+        private static readonly Regex _regex = new Regex(@"^https?://(.+/jackett/api/v2.0/indexers/\w+)/", RegexOptions.Compiled);
+
+        public static string GetRateLimitKey(HttpRequest request)
+        {
+            var match = _regex.Match(request.Url.ToString());
+
+            if (match.Success)
+            {
+                return match.Groups[1].Value;
+            }
+
+            return request.Url.Host;
+        }
+            
+    }
+}